Crysto Wallpaper is a nice app that has large variety of 4k wallpapers and live wallpapers.If you are not satisfied with your system homescreen background,try it. -10000+ wallpapers,all in 4k and HD quality. -Live wallpaper:making your homescreen dynamic. -3D wallpaper:set wallpaper in 3D effect -Varieties:Popular/Nature/Winter/Beauty/Cartoon/Car…. -Phone Transparent:transparent effect background,making your phone pretty cool -Wallpaper Auto Change:change your phone background automatically -Call Flash:you can customize your caller screen with our themes